<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>拖动的模块框</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      .login-header {
        background-color: rgb(146, 138, 138);
        text-align: center;
        width: 1366px;
        height: 635px;
      }
      h6,
      a {
        margin: 0;
        padding: 0;
      }

      .login {
        display: none;
        width: 512px;
        height: 280px;
        position: fixed;
        border: #ebebeb solid 1px;
        left: 50%;
        top: 50%;
        background-color: #ffffff;
        box-shadow: 0px 0px 20px #ddd;
        z-index: 9999;
        transform: translate(-50%, -50%);
      }

      .login-title {
        width: 100%;
        height: 40px;
        font-size: 18px;
        position: relative;
        cursor: move;
        text-align: center;
        margin-top: 25px;
      }

      .login-input-content {
        margin-top: 20px;
      }

      .login-button {
        width: 50%;
        margin: 30px auto 0px auto;
        line-height: 40px;
        font-size: 14px;
        border: #ebebeb 1px solid;
        text-align: center;
      }

      .login-bg {
        display: none;
        width: 100%;
        height: 10%;
        position: fixed;
        top: 0px;
        left: 0px;
        background-color: rgba(0, 0, 0, -3);
      }

      a {
        text-decoration: none;
        color: #000;
      }

      .login-button a {
        display: block;
      }

      .login-input input.list-input {
        float: left;
        line-height: 35px;
        height: 35px;
        width: 350px;
        border: #ebebeb 1px solider;
        text-indent: 5px;
      }

      .login-input {
        overflow: hidden;
        margin: 0px 0px 0px 0px;
      }

      .login-input label {
        float: left;
        width: 90px;
        padding-right: 10px;
        text-align: right;
        line-height: 35px;
        height: 35px;
        font-size: 14px;
      }

      .login-title span {
        position: absolute;
        font-size: 12px;
        right: -20px;
        top: -30px;
        background-color: #fff;
        border: #ebebeb solider 1px;
        width: 40px;
        height: 40px;
        border-radius: 20px;
      }
    </style>
  </head>
  <body>
    <div class="login-header">
      <a id="link" href="javascript:;">点击，弹出登录框</a>
    </div>
    <div id="login" class="login">
      <div id="title" class="login-title">
        登录会员
        <span
          ><a id="closeBtn" href="javascript:void(0);" class="close-login"
            >关闭</a
          ></span
        >
      </div>
      <div class="login-input-content">
        <div class="login-input">
          <label>用户名：</label>
          <input
            type="text"
            placeholder="请输入用户名"
            name="info[username]"
            id="username"
            class="username"
          />
        </div>
        <div class="login-input">
          <label>登录密码：</label>
          <input
            type="password"
            placeholder="请输入登录密码"
            name="info[password]"
            id="password"
            class="password"
          />
        </div>
      </div>
      <div id="loginbtn" class="logion-button">
        <a href="javascript:void(0);" id="login-button-submit" class=""></a>
      </div>
    </div>
    <!-- 遮盖层 -->
    <div id="bg" class="login-bg"></div>
    <script>
      // 1.获取元素
      var login = document.querySelector('.login')
      var mask = document.querySelector('.login-bg')
      var link = document.querySelector('#link')
      var closeBtn = document.querySelector('#closeBtn')
      var title = document.querySelector('#title')
      // 2.点击弹出层这个链接
      link.addEventListener('click', function () {
        mask.style.display = 'block'
        login.style.display = 'block'
      })
      // 3.点击closeBtn就隐藏 mask 和 login
      closeBtn.addEventListener('click', function () {
        mask.style.display = 'none'
        login.style.display = 'none'
      })
      // 4.开始拖拽
      // (1).当我们鼠标按下，就获得鼠标在盒子内的坐标
      title.addEventListener('mousedown', function (e) {
        var x = e.pageX - login.offsetLeft
        var y = e.pageY - login.offsetTop
        // (2).鼠标移动的时候，把鼠标在页面的坐标，减去，鼠标在盒子内的坐标就是模态框的left和top值
        document.addEventListener('mousemove', move)
        function move(e) {
          login.style.left = e.pageX - x + 'px'
          login.style.top = e.pageY - y + 'px'
        }
        // (3).鼠标弹起，就让鼠标移动事件移除
        document.addEventListener('mouseup', function () {
          document.removeEventListener('mousemove', move)
        })
      })
    </script>
  </body>
</html>
